Pin-stem joint



Aug. 28, 1928. 1,682,585 A. E. WALLER PIN STEM JOINT Filed Jan. 18, 1928 ATTORNEYS.

Patented Aug. 28, 1928.

UNITED STATES 1,682,585 PATENT OFFICE.

E. WALLEB, OF PROVIDENCE, RHODE ISLAND.

PIN-STEM JOINT.

Application flledJanuary 18, 1928. fierial No. 247,544.

This invention relatesto an improved construction of pin'stem joint; and has for its object to provide a pin stem joint which 18 formed of sheet stock and folr ed to prov de a a bridge portion with two spaced upstanding cars in which the pin stem is to be pivotally mounted and to provide on the opposite edges of this bridge portion spurs to be forced into a base memberof relatively soft 1-.) material to automatically spread or separate as forced therein for the purpose of locking the joint to the base.

lVith these and other objects in view, the invention consists of certain novel features of construction, as will be more fully described, and particularly pointed out n the appended claims.

In the accompanying drawlngs: I

Figure 1 is a side elevation illustrating 111v improved joint member as secured to a llisc of celluloid and mounted on a bar of celluloid.

Figure 2 is a perspective View of a celluloid disc base member.

Figure 3 is a view of the joint member as blanked from sheet stock showing the pivot ears extended from opposite sides of the bridge and spurs extending from the ends of the bridge.

Figure 4 is a section on line 4-4 of Fig. 3 showing the spurs as bent upwardly slightly relative to the plane of the bridge.

Figure 5 is a section through the ears showing the spur as bent downwardly therefrom the ears being left partially open to permit the forcing plunger to engage the bridge portion thereof.

Figure 6 is a side elevation of the joint member sectioned through the bridge and showing the spurs as extending downwardly therefrom with their points turned outwardly.

Figure 7 is a view sectioned through the ears illustrating the plunger as engaging the bridge and forcing the spurs into the disc of celluloid.

Figure 8 shows the joint member with its spurs spread in opposite directions upon being forced into the celluloid disc.

u Figure 9 is an edge view of the joint member showing the upstanding ears and the spurs extending downwardly from the bridge between the ears.

It is found in practice of advantage to a provide means whereby a metal pin stem joint may be readily attached to a disc of celluloid so that the same may be sold as a complete commercial article thus facilitating the assembling of the parts of inexpensive celluloid jewelry. In other words if a pin stem canbe bought from the manufacturer of joints and all. connected to the celluloid disc then the makers of the celluloid articles such as brooches and the like can readily cement this disc to the back of the celluloid bar and thus readily attaching the pin stem joint thereto. Applicant has found that in order to facilitate the attaching of'the joint member to the celluloid disc he is obliged to form a pair of spaced downwardly-turned pointed spurs on the bridge of the joint member and to either bend the points ofv the downwardly-extending spurs outwardly or bevel the inner surface at the points of,

the spurs or both in order to cause these points to turn or spread outwardly as they are forced into the cold or uusoftened celluloid without injuring the celluloid by such attaching process; and the following is a detailed description of the present embodiment of my invention and showing one construction of pin stem oint member by which these advantageous results my be accomplished lVith reference to the drawings, 10 designates the pin stem joint which is formed from sheet metal the same having a bridge portion 11 from opposite sides of which are folded upwardly the pivot cars 12, the same being pierced or recessed as at 13 to receive a pivot pin. This bridge portion between the cars is preferably of a width somewhat less than the greatest width of the ears for the purpose presently described. Also extending from this narrow bridge portion are the two pivot spurs 15 which are pointed as at 16 to facilitate their being driven into a disc of celluloid and by making the width of the bridge narrower I am enabled to at tach it to a celluloid disc of very small diameter.

After these spurs are formed on the blank as illustrated in Fig. 3, they are turned down into the position best illustrated in Fig. 6 and these pointed ends 16 are beveled slightly on their inner surfaces toward the point as at 18 so that when forced into the celluloid disc 17 they will automatically spread into substantially the position illustrated in F i'g, 8, thereby securely riveting or looking cles of celluloid, which greatly facilitates the attaching of the joint to such articles.

The foregoing description is directed sole- 1 towards the construction illustrated, but li desire it to he understood that I reserve the privilege of resorting to all the mechanical changes to which the device is susceptihle, the invention being defined and limited only by the terms of the appended claims.

I claim:

1. An article of manufacture comprising a pin stem joint member having a base formed of a disc of celluloid, the joint member being formed of sheet metal folded to provide a. bridge portion with two spaced upstanding ears to pivotally support a pin stem, the opposite edges of the bridge between the ears having downwardly and outwardly turned pointed spurs imhedded in said celluloid disc permanently securing the disc to the joint.

2. An article of manufacture comprising a pin stem joint member having a base formed of a disc of celluloid, the joint mem her being formed of sheet metal folded to provide a bridge portion with two spaced upstanding ears to pivotally support a pin stem, the width of the bridge between the ears being less than that of the greatest width of the ears, the opposite edges of the bridge between theears having downwardly and outwardly turned pointed spurs imbedded in said celluloid permanently securing the disc to the joint.

In testimony whereof I affix my signature.

ANTHONY E. WALLER. 

